Martin Oswald wrote:
> Hello,
> 
> on playing with isosurfaces I managed to create a spiral spring, but
> rendering took quite some time. So my idea was to replace the containing box
> by a tube, i.e. a difference of two cylinders.Of course, it didn't work, and
> re-reading the manual taught me that boxes and spheres are the only possible
> isosurface containers.

In fact the contained_by{} statement does not parse a shape, the fact 
that the syntax is identical to the box and sphere shape is pure 
coincidence.

> Now my questions are: Does anybody know if additional containers are planned
> in future releases? 

There is no such feature planned.

> Can I expect a considerable reduction of rendering time
> if I reduce the container size as far as possible (without cutting the
> isosurface)?

As written in the docs the container should be as tight as possible for 
minimum render time.

Christoph

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